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prov that sin3A=?

Calculus1
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  • hba
This is not a proof ?
  • hba
sin3A= something which we have to prove ?
  • hba
@mustry Please reply ?

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Other answers:

Prove sin3A=? sin3A=sin(A+2A) use sin(A+B)=sinAcosB+cosAsinB sin2A=2sinAcosA
good
actually u know
no ur suppose to expand it
sin(2A+A)=sin2AcosA+cos2AsinA
BUT cos2A=cos^A+sin^A
cos2A=cos^2A-sin^2A =1-2sin^2A =2cos^2A-1
OKAY put it in the equestn
ur r8

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